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Kyanite, whose name derives from the Greek word kyanos, meaning blue, -it is a cut stone that is pale to deep blue or white, grey, or green….It is a silicate of aluminium that is formed during the regional metamorphism of clay-rich sediments, usually occurring in blue, blade-shaped crystals. it is trimorphous with andalusite and sillimanite. [AHDOS] also spelled CYANITE, also called DISTHENE, It is an indicator of deep burial of a terrain rather and high stress